Distortion compensation applied to stereoscopic PIV in a mixing tank

D. F. Hill, K. V. Sharp, R. J. Adrian

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations


Stereoscopic particle image velocimetry (PIV) measurements of the turbulent flow around a Rushton turbine are presented. Three-dimensional instantaneous velocity fields were obtained on a variety of different planes and at a variety of rotational speeds. An angular offset configuration was used and tilt-axis mounts were incorporated in order to satisfy the Scheimpflug condition, significantly reducing the ordinarily large depth of field requirements of such configurations. To account for the significant distortion inherent in the experimental set-up, a distortion compensation procedure, or in-situ calibration, was utilized. This registration procedure is advantageous because it accounts for all distorting influences between the object and image planes and allows for the rapid set-up of a stereoscopic experiment. The calibration procedure was validated using two tests, one a rigid translation of a speckle target, the other the viscous flow between two concentric cylinders. The results of the tests indicate that a distortion compensation procedure may be successfully applied to real fluid flows. Phase-locked instantaneous data were ensemble-averaged and interpolated in order to obtain mean three-dimensional velocity fields on a cylindrical shell enclosing the turbine blade. From these fields, the tip vortex pairs documented in previous studies were easily identified.

Original languageEnglish (US)
Title of host publicationProceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
PublisherAmerican Society of Mechanical Engineers
Number of pages1
ISBN (Print)0791819612
StatePublished - Dec 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Environmental Science(all)


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